Another cobra owner and myself just insatlled RR pulley & Idler sets today. Mine was 2.80 & his was 2.9? both with Idlers his went on more snug than mine. I don't know how his is doing but My pulley is walking on the shaft. I marked it in two places and it has spun 180* in 60 miles. I have not doged out the car, I've been testing the waters (2 WOT runs) with it but not much. What should I do? Will it stop spinning or should I take it off and get a new one?